EE10 implements a significant enhancement in the pre- and post-processing capabilities of the EFDC_Explorer Modeling System. Along with new features and capabilities, EE10 presents an improved system of organizing the model settings and the viewing option that will be familiar to users acquainted with GIS and similar software tools.
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DSI LLC. 2022. EFDC+ Theory, Version 10.3. Published by DSI LLC, Edmonds WA. Available at:
https://www.eemodelingsystem.com/wp-content/Download/Documentation/EFDC Theory Document Ver 10.3 2022.05.03.pdf
What's New in EEMS11.1?
EEMS11.1 implements a number of enhancements. The ability to export the EFDC+ output files in the latest NetCDF UGRID format provides considerable efficiency gains. This approach has been used in the Lake Washington Real-time model for some time and is now being made available to users of EEMS. At the request of several clients, we have upgraded EFDC+ so that it can now write the hydrolink file required by the WASP8 water quality model. These enhancements and several others are outlined on this page, and briefly summarized below with links to the relevant pages in this User's Guide. Changes have been made to both EE and EFDC+ unless otherwise noted:
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Use of Spatially and Temporary Varying Fields
EEMS10 now has the ability to simulate spatially and temporally varying fields, such as a wind or barometric pressure fields. EFDC+ can receive time varying forcings within its computational domain from external sources in the form of ASCII or binary files. These fields can be configured for:
- Topographic data (e.g., dredging/dumping, land erosion/reclamation, subsidence)
- Roughness (e.g., seasonal roughness)
- Vegetation field
- Seepage/groundwater flow
- Wind field (e.g., cyclone)
- Barometric pressure field (e.g., cyclone)
- Rainfall
- Evaporation
- Wind shelter field
- Sun shading field
- Ice thickness
- SEDZLJ erosion rate multiplier
- SEDZLJ erosion rate exponent
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- Improved sediment bed initialization with more QC checking.
- User defined cell by cell activation/deactivation of sediment transport for both SEDZLJ and Original sediment module.
- Updates to SEDZLJ:
- Added equation-based erosion rate calculations (E = A*tau^N)
- User specified maximum erosion rate by class and layer
- Added cell by cell sediment bed characteristics independent of SEDFLUME cores
- Improved bed shear calculation approach (Parker, 2004)
User Defined Dye Classes
The number of dye classes is now unlimited, with each class able to have a unique set of properties including:
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- Face blocking can be applied to block vertical layers. The user defines the height from the top (draft) and bottom (sill) of the water column for the blocking layer
- Layers may be configured as fixed or floating, and can be attached to an anchor.
- This new capability allows the model to simulate partially blocked depths due to floating objects (e.g. ships and bridges), baffles, submerged weirs, and/or other submerged features. The blockages influence flow, constituent transport, particle tracking and wave action.
Other Enhancements
- Dry and wet atmospheric deposition of toxics
- Restructured water column transport and vertical diffusion to reduce computational times.
- Spatially varying background vertical diffusivity (AVO).
- The reported flows in the EE linkage file EE_BC.OUT now contains integrated flows for better mass balance calculations in EE.
- Other code changes to improve model performance and accuracy.
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